. >>> first up tonight, president obama will travel to boston thursday for an interfaith service with bombing victims. more than 24 hours after two bombs ripped through marathon crowds killing three, wounding 170 others, investigators are still no closer to answers. late this afternoon, the fbi said no claims of responsibility have been received, and the search for suspects is wide open. deborah boxdy joins us now from boston with all of the latest. good evening, deborah. >> reporter: good evening, larry. i'm live here along boylston street in the heart of boston, about four blocks or so away from the marathon's finish line, where those two bombs exploded just one day ago. security around the city remains extremely tight, as people try to move on after that devastating attack. three people died, including 8-year-old martin richard of dorchester, massachusetts. more than 170 others were hurt. some of them losing limbs. earlier today, authorities began processing that crime scene, which now stretches about 12 city blocks. they detailed some of the evidence found at the scene during an e